Highly adaptive recording method and optical recording apparatus

Abstract

An optical disk recording method includes the steps of: providing a multi-pulse chain from a recording wave; independently changing the pulse rise timing and pulse fall timing (pulse width) of the first pulse in the multi-pulse chain in accordance with a preceding space length and a recording mark length; changing the pulse rise timing and pulse fall timing (pulse width) in accordance with a following space length and the recording mark length in a predetermined timing or in independence; and in relation to the smallest mark recorded by irradiation with mono pulse, changing the rise timing in accordance with the preceding space length and the recording mark length and the fall timing (pulse width) in accordance with the following space length and recording mark length, compensating various optical disks different in recording material without change of the fundamental waveform.

1. An optical disk recording method used for an optical disk having a recording film capable of being changed to an optically different state by irradiation with an energy beam to thereby record information, said method being provided for recording information as a recording mark length and preceding and following space lengths in said optically different state by irradiating said recording film with a multi-pulse chain of said energy beam having at least two emission power levels each having an emission time changed in accordance with said optical disk while there is relative movement between said energy beam and a surface of said recording film of said optical disk, the method comprising steps of:
 recording information on the optical disk with the multi-pulse chain using setting-values; and 
 changing a position and a width of a first pulse in the multi-pulse chain on the basis of a first table and a second table, wherein: 
 the setting-values concerning the multi-pulse chain for predetermined recording velocity are expressed as a sum of a linear term and a nonlinear term, and coefficients of the linear term and the nonlinear term are expressed as integers respectively, 
 the first table has coefficients of the linear term for the predetermined recording velocity and is designed to specify the position of the first pulse, and the coefficients in the first table are defined based on recording mark length and preceding space length, and 
 the second table has coefficients of the linear term and the nonlinear term for the predetermined recording velocity and is designed to specify the width of the first pulse, and the coefficients in the second table are defined based on recording mark length and preceding space length. 
 
   
   
     2. An optical disk device comprising:
 an energy beam generator, 
 a power adjusting unit by which emission power of an energy beam generated by said energy beam generator can be set to have at least two predetermined power levels, 
 a holding mechanism for holding an optical disk having a recording film capable of being changed to an optically different state by irradiation with said energy beam having said predetermined power levels to thereby record information, 
 a moving unit by which relative movement is provided between said energy beam and a surface of said recording film of said optical disk, and 
 a conversion unit for converting information to be recorded into a power level change of said energy beam, 
 said optical disk device being provided for recording information as a recording mark length and preceding and following space lengths in said optically different state by irradiating said recording film with a multi-pulse chain of said energy beam having said power levels each having an emission time changed in accordance with said optical disk while operating said moving unit, wherein: 
 said optical disk device further comprises a storage unit; 
 said storage unit stores setting-values concerning the multi-pulse chain for predetermined recording velocity, the setting-values are expressed as a sum of a linear term and a nonlinear term, and coefficients of the linear term and the nonlinear term are expressed as integers respectively, 
 said storage unit further includes a first table and a second table for changing a position and a width of a first pulse in the multi-pulse chain; 
 the first table has coefficients of the linear term for the predetermined recording velocity and is designed to specify the position of the first pulse, and the coefficients in the first table are defined based on recording mark length and preceding space length, 
 the second table has coefficients of the linear term and the nonlinear term for the predetermined recording velocity and is designed to specify the width of the first pulse, and the coefficients in the second table are defined based on recording mark length and preceding space length, and 
 said power adjusting unit performs emission pulse timing control referring to said first and second tables. 
 
   
   
     3. An optical disk having a recording film capable of being changed to an optically different state by irradiation with a multi-pulse chain of an energy beam having at least two emission power levels to thereby record information as a recording mark length and preceding and following space lengths, the optical disk comprising:
 setting-values concerning the multi-pulse chain for predetermined recording velocity, 
 a first table designed to specify a position of a first pulse of a multi-pulse chain, and 
 a second table designed to specify the width of the first pulse, wherein: 
 the setting-values are expressed as a sum of a linear term and a nonlinear term, and coefficients of the linear term and the nonlinear term are expressed as integers respectively, 
 the first table has coefficients of the linear term for the predetermined recording velocity, and the coefficients in the first table are defined based on recording mark length and preceding space length, and 
 the second table has coefficients of the linear term and the nonlinear term for the predetermined recording velocity, and the coefficients in the second table are defined based on recording mark length and preceding space length.